Method withLock

src/utils.ts:301–308

* Execute a function while holding the lock

(fn: () => T)

   * Execute a function while holding the lock
   */
  withLock<T>(fn: () => T): T {
    this.acquire();
    try {
      return fn();
    } finally {
      this.release();
    }
  }

  /**
   * Execute an async function while holding the lock